Cannot Connect To Internet After Upgrade To 24.04.2 LTS. The Computer Seems Connected Both Via Wifi And Usb Tether

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Cannot Connect to Internet After Upgrade to 24.04.2 LTS: Troubleshooting Steps

Upgrading to a new version of an operating system can sometimes lead to unexpected issues, especially when it comes to internet connectivity. If you've recently upgraded to Kubuntu 24.04.2 LTS and are experiencing difficulties connecting to the internet, you're not alone. In this article, we'll explore the possible causes and provide step-by-step troubleshooting steps to help you resolve the issue.

After upgrading to Kubuntu 24.04.2 LTS, everything seemed fine. The computer seemed to connect correctly, but then there was no internet. You've tried both WiFi and USB-tether, but neither works. While this issue can be frustrating, it's essential to understand that it's not uncommon, especially after a major system upgrade.

Before we dive into the troubleshooting steps, let's explore some possible causes of this issue:

  • DNS issues: Problems with DNS (Domain Name System) resolution can prevent you from accessing the internet.
  • Network configuration: Incorrect or incomplete network configuration can lead to connectivity issues.
  • Driver issues: Outdated or corrupted network drivers can cause problems with internet connectivity.
  • System configuration: Changes to system settings or configuration files can affect internet connectivity.

Now that we've identified some possible causes, let's move on to the troubleshooting steps:

Step 1: Check Network Configuration

The first step is to check your network configuration. You can do this by running the following command in the terminal:

sudo netplan generate
sudo netplan apply

This will generate and apply the network configuration. If you're using a wired connection, try unplugging and replugging the Ethernet cable to ensure it's properly connected.

Step 2: Check DNS Resolution

Next, let's check DNS resolution. You can do this by running the following command in the terminal:

dig google.com

This will perform a DNS lookup for the domain google.com. If the lookup is successful, you should see the IP address of the server. If the lookup fails, it may indicate a DNS issue.

Step 3: Check Network Drivers

Outdated or corrupted network drivers can cause problems with internet connectivity. To check the network drivers, run the following command in the terminal:

sudo lshw -c network

This will list the network devices and their drivers. If you see any outdated or corrupted drivers, you can update them using the following command:

sudo apt update
sudo apt upgrade

Step 4: Check System Configuration

Changes to system settings or configuration files can affect internet connectivity. To check the system configuration, run the following command in the terminal:

sudo cat /etc/network/interfaces

This will display the network configuration file. If you see any changes or errors, you can try resetting the file to its default state using the following command:

sudo mv /etc/network/interfaces /etc/network/interfaces.backup
sudo netplan generate
sudo netplan apply

Step 5: Disable and Re-enable Network Interfaces

Sometimes, disabling and re-enabling network interfaces can resolve connectivity issues. To do this, run the following command in the terminal:

sudo ip link set wlp3s0 down
sudo ip link set wlp3s0 up

Replace wlp3s0 with the name of your WiFi interface.

Step 6: Restart Network Manager

If none of the above steps resolve the issue, try restarting the Network Manager service:

sudo systemctl restart network-manager

Step 7: Reinstall Network Manager

If the issue persists, try reinstalling the Network Manager package:

sudo apt purge network-manager
sudo apt install network-manager

Step 8: Reconfigure Network Settings

If none of the above steps resolve the issue, try reconfiguring your network settings. You can do this by running the following command in the terminal:

sudo kwriteconfig --file /etc/NetworkManager/system-connections/your-connection-name --key ipv4.method --type string "auto"

Replace your-connection-name with the name of your network connection.

Q: I've tried all the troubleshooting steps, but I still can't connect to the internet. What should I do next?

A: If you've tried all the troubleshooting steps outlined in this article and still can't connect to the internet, it's possible that the issue is more complex. In this case, you may want to consider seeking help from a professional, such as a Linux administrator or a computer technician. They can help you diagnose and fix the issue.

Q: I'm using a wired connection, but I still can't connect to the internet. What could be the problem?

A: If you're using a wired connection and still can't connect to the internet, it's possible that the issue is with your network configuration or your router. Try unplugging and replugging the Ethernet cable to ensure it's properly connected. If the issue persists, try restarting your router and modem.

Q: I've tried disabling and re-enabling my network interface, but it still doesn't work. What could be the problem?

A: If disabling and re-enabling your network interface doesn't work, it's possible that the issue is with your network driver or your system configuration. Try updating your network driver using the following command:

sudo apt update
sudo apt upgrade

If the issue persists, try resetting your system configuration to its default state using the following command:

sudo mv /etc/network/interfaces /etc/network/interfaces.backup
sudo netplan generate
sudo netplan apply

Q: I'm using a USB tether, but I still can't connect to the internet. What could be the problem?

A: If you're using a USB tether and still can't connect to the internet, it's possible that the issue is with your USB tether or your system configuration. Try restarting your USB tether and your system. If the issue persists, try resetting your system configuration to its default state using the following command:

sudo mv /etc/network/interfaces /etc/network/interfaces.backup
sudo netplan generate
sudo netplan apply

Q: I've tried reinstalling Network Manager, but it still doesn't work. What could be the problem?

A: If reinstalling Network Manager doesn't work, it's possible that the issue is with your system configuration or your network driver. Try updating your network driver using the following command:

sudo apt update
sudo apt upgrade

If the issue persists, try resetting your system configuration to its default state using the following command:

sudo mv /etc/network/interfaces /etc/network/interfaces.backup
sudo netplan generate
sudo netplan apply

Q: I'm using a VPN, but I still can't connect to the internet. What could be the problem?

A: If you're using a VPN and still can't connect to the internet, it's possible that the issue is with your VPN configuration or your system configuration. Try restarting your VPN and your system. If the issue persists, try resetting your system configuration to its default state using the following command:

sudo mv /etc/network/interfaces /etc/network/interfaces.backup
sudo netplan generate
sudo netplan apply

Q: I've tried all the troubleshooting steps, but I still can't connect to the internet. What should I do next?

A: If you've tried all the troubleshooting steps outlined in this article and still can't connect to the internet, it's possible that the issue is more complex. In this case, you may want to consider seeking help from a professional, such as a Linux administrator or a computer technician. They can help you diagnose and fix the issue.

In conclusion, if you're experiencing difficulties connecting to the internet after upgrading to Kubuntu 24.04.2 LTS, there are several troubleshooting steps you can take to resolve the issue. By following the steps outlined in this article, you should be able to identify and fix the problem. Remember to always back up your system configuration files before making any changes, and consider seeking help from a professional if you're unsure about any of the steps.